I have a turbo b16 civic with 1000cc injectors 255lph pump and thinking about putting in a bosch inline fuel pump I have upgraded the fuel line to a 4an line. In a few months I have to swap in the stock d16 motor for emissions purposes along with the ecu. Bascially I'm gonna converit it back to stock for the test. I was wondering with the stock motor stock injectors and stock ecu if i left the 255 in the tank and left the upgraded line would it be a problem to run on all stock parts like would the fuel pressure be to much or would it be ok.

 

nah, you're fine. Many of us who plan to upgrade anyway (that had an old 10-15 yr old pump) put in the new one anyway even before new injectors. remember, you have a fuel return system (unlike the K-engines) that will compensate.